<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const str = 'aaabbbbaawwwweeeaaaa3333eee'
      const obj = {}
      for (const key of str) {
        if (Object.keys(obj).includes(key)) {
          obj[key] += 1
        } else {
          obj[key] = 1
        }
      }
      console.log(obj)
      // 求次数最多的
    </script>
  </body>
</html>
